US STOCKS-Wall St gains on Yellen comments and Yahoo; BofA falls By: Reuters: Company News April 16, 2014 at 16:41 PM EDT * Dow up 1 pct; S&P 500 up 1.1 pct; Nasdaq up 1.3 pct (Updates to close) Read More >> Related Stocks: American Express Bank of America CSX Corp Citigroup Coca-Cola Company Google, Inc. Intel Corp International Business Machines Yahoo